The M-05 Viesturs ship from Latvia, a minehunter, is currently already docked at the site.

It is set to be joined by Dutch minesweeper HNLMS Urk, a superfast missile patrol boat decked out in camouflage colours called HNoMS Skudd from Norway, German-built minesweeper LNS Kursis from Lithuania and the latest French vessel to hold the historic name La Motte Picquet.

The Royal Navy’s HMS Biter patrol boat and HMS Express fast patrol boat will also be part of the contingent.

Cardiff Bay and HMS Duncan is set to be the location for one of the three working dinners taking place in the capital on Thursday evening.

Fences similar to the one erected in Cardiff City Centre have also appeared around Roath Lock, with residents reporting seeing armed and non-armed police in the bay area.

The bulk of the business of the summit will take place in the Celtic Manor Resort in Newport.

Yesterday people in Cardiff were given a surprise when a number of helicopters, including the vehicle that acts as Marine One when it carries the US president, were seen hovering over the city and landing at Bute Park.